1 //===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file declares the COFFObjectFile class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Object/COFF.h" 15 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/ADT/SmallString.h" 17 #include "llvm/ADT/StringSwitch.h" 18 #include "llvm/ADT/Triple.h" 19 #include "llvm/Support/Debug.h" 20 #include "llvm/Support/raw_ostream.h" 21 #include <cctype> 22 23 using namespace llvm; 24 using namespace object; 25 26 namespace { 27 using support::ulittle8_t; 28 using support::ulittle16_t; 29 using support::ulittle32_t; 30 using support::little16_t; 31 } 32 33 namespace { 34 // Returns false if size is greater than the buffer size. And sets ec. 35 bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) { 36 if (m->getBufferSize() < size) { 37 ec = object_error::unexpected_eof; 38 return false; 39 } 40 return true; 41 } 42 43 // Sets Obj unless any bytes in [addr, addr + size) fall outsize of m. 44 // Returns unexpected_eof if error. 45 template<typename T> 46 error_code getObject(const T *&Obj, const MemoryBuffer *M, const uint8_t *Ptr, 47 const size_t Size = sizeof(T)) { 48 uintptr_t Addr = uintptr_t(Ptr); 49 if (Addr + Size < Addr || 50 Addr + Size < Size || 51 Addr + Size > uintptr_t(M->getBufferEnd())) { 52 return object_error::unexpected_eof; 53 } 54 Obj = reinterpret_cast<const T *>(Addr); 55 return object_error::success; 56 } 57 } 58 59 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const { 60 const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p); 61 62 # ifndef NDEBUG 63 // Verify that the symbol points to a valid entry in the symbol table. 64 uintptr_t offset = uintptr_t(addr) - uintptr_t(base()); 65 if (offset < COFFHeader->PointerToSymbolTable 66 || offset >= COFFHeader->PointerToSymbolTable 67 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 68 report_fatal_error("Symbol was outside of symbol table."); 69 70 assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) 71 == 0 && "Symbol did not point to the beginning of a symbol"); 72 # endif 73 74 return addr; 75 } 76 77 const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const { 78 const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p); 79 80 # ifndef NDEBUG 81 // Verify that the section points to a valid entry in the section table. 82 if (addr < SectionTable 83 || addr >= (SectionTable + COFFHeader->NumberOfSections)) 84 report_fatal_error("Section was outside of section table."); 85 86 uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable); 87 assert(offset % sizeof(coff_section) == 0 && 88 "Section did not point to the beginning of a section"); 89 # endif 90 91 return addr; 92 } 93 94 error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb, 95 SymbolRef &Result) const { 96 const coff_symbol *symb = toSymb(Symb); 97 symb += 1 + symb->NumberOfAuxSymbols; 98 Symb.p = reinterpret_cast<uintptr_t>(symb); 99 Result = SymbolRef(Symb, this); 100 return object_error::success; 101 } 102 103 error_code COFFObjectFile::getSymbolName(DataRefImpl Symb, 104 StringRef &Result) const { 105 const coff_symbol *symb = toSymb(Symb); 106 return getSymbolName(symb, Result); 107 } 108 109 error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Symb, 110 uint64_t &Result) const { 111 const coff_symbol *symb = toSymb(Symb); 112 const coff_section *Section = NULL; 113 if (error_code ec = getSection(symb->SectionNumber, Section)) 114 return ec; 115 116 if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) 117 Result = UnknownAddressOrSize; 118 else if (Section) 119 Result = Section->PointerToRawData + symb->Value; 120 else 121 Result = symb->Value; 122 return object_error::success; 123 } 124 125 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb, 126 uint64_t &Result) const { 127 const coff_symbol *symb = toSymb(Symb); 128 const coff_section *Section = NULL; 129 if (error_code ec = getSection(symb->SectionNumber, Section)) 130 return ec; 131 132 if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) 133 Result = UnknownAddressOrSize; 134 else if (Section) 135 Result = Section->VirtualAddress + symb->Value; 136 else 137 Result = symb->Value; 138 return object_error::success; 139 } 140 141 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb, 142 SymbolRef::Type &Result) const { 143 const coff_symbol *symb = toSymb(Symb); 144 Result = SymbolRef::ST_Other; 145 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL && 146 symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) { 147 Result = SymbolRef::ST_Unknown; 148 } else { 149 if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) { 150 Result = SymbolRef::ST_Function; 151 } else { 152 uint32_t Characteristics = 0; 153 if (symb->SectionNumber > 0) { 154 const coff_section *Section = NULL; 155 if (error_code ec = getSection(symb->SectionNumber, Section)) 156 return ec; 157 Characteristics = Section->Characteristics; 158 } 159 if (Characteristics & COFF::IMAGE_SCN_MEM_READ && 160 ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only. 161 Result = SymbolRef::ST_Data; 162 } 163 } 164 return object_error::success; 165 } 166 167 error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb, 168 uint32_t &Result) const { 169 const coff_symbol *symb = toSymb(Symb); 170 Result = SymbolRef::SF_None; 171 172 // TODO: Correctly set SF_FormatSpecific, SF_ThreadLocal, SF_Common 173 174 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL && 175 symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) 176 Result |= SymbolRef::SF_Undefined; 177 178 // TODO: This are certainly too restrictive. 179 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL) 180 Result |= SymbolRef::SF_Global; 181 182 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) 183 Result |= SymbolRef::SF_Weak; 184 185 if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE) 186 Result |= SymbolRef::SF_Absolute; 187 188 return object_error::success; 189 } 190 191 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb, 192 uint64_t &Result) const { 193 // FIXME: Return the correct size. This requires looking at all the symbols 194 // in the same section as this symbol, and looking for either the next 195 // symbol, or the end of the section. 196 const coff_symbol *symb = toSymb(Symb); 197 const coff_section *Section = NULL; 198 if (error_code ec = getSection(symb->SectionNumber, Section)) 199 return ec; 200 201 if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) 202 Result = UnknownAddressOrSize; 203 else if (Section) 204 Result = Section->SizeOfRawData - symb->Value; 205 else 206 Result = 0; 207 return object_error::success; 208 } 209 210 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb, 211 section_iterator &Result) const { 212 const coff_symbol *symb = toSymb(Symb); 213 if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED) 214 Result = end_sections(); 215 else { 216 const coff_section *sec = 0; 217 if (error_code ec = getSection(symb->SectionNumber, sec)) return ec; 218 DataRefImpl Sec; 219 Sec.p = reinterpret_cast<uintptr_t>(sec); 220 Result = section_iterator(SectionRef(Sec, this)); 221 } 222 return object_error::success; 223 } 224 225 error_code COFFObjectFile::getSymbolValue(DataRefImpl Symb, 226 uint64_t &Val) const { 227 report_fatal_error("getSymbolValue unimplemented in COFFObjectFile"); 228 } 229 230 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec, 231 SectionRef &Result) const { 232 const coff_section *sec = toSec(Sec); 233 sec += 1; 234 Sec.p = reinterpret_cast<uintptr_t>(sec); 235 Result = SectionRef(Sec, this); 236 return object_error::success; 237 } 238 239 error_code COFFObjectFile::getSectionName(DataRefImpl Sec, 240 StringRef &Result) const { 241 const coff_section *sec = toSec(Sec); 242 return getSectionName(sec, Result); 243 } 244 245 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec, 246 uint64_t &Result) const { 247 const coff_section *sec = toSec(Sec); 248 Result = sec->VirtualAddress; 249 return object_error::success; 250 } 251 252 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec, 253 uint64_t &Result) const { 254 const coff_section *sec = toSec(Sec); 255 Result = sec->SizeOfRawData; 256 return object_error::success; 257 } 258 259 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec, 260 StringRef &Result) const { 261 const coff_section *sec = toSec(Sec); 262 ArrayRef<uint8_t> Res; 263 error_code EC = getSectionContents(sec, Res); 264 Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size()); 265 return EC; 266 } 267 268 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec, 269 uint64_t &Res) const { 270 const coff_section *sec = toSec(Sec); 271 if (!sec) 272 return object_error::parse_failed; 273 Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1); 274 return object_error::success; 275 } 276 277 error_code COFFObjectFile::isSectionText(DataRefImpl Sec, 278 bool &Result) const { 279 const coff_section *sec = toSec(Sec); 280 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE; 281 return object_error::success; 282 } 283 284 error_code COFFObjectFile::isSectionData(DataRefImpl Sec, 285 bool &Result) const { 286 const coff_section *sec = toSec(Sec); 287 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA; 288 return object_error::success; 289 } 290 291 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec, 292 bool &Result) const { 293 const coff_section *sec = toSec(Sec); 294 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; 295 return object_error::success; 296 } 297 298 error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec, 299 bool &Result) const { 300 // FIXME: Unimplemented 301 Result = true; 302 return object_error::success; 303 } 304 305 error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec, 306 bool &Result) const { 307 const coff_section *sec = toSec(Sec); 308 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; 309 return object_error::success; 310 } 311 312 error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec, 313 bool &Result) const { 314 // FIXME: Unimplemented. 315 Result = false; 316 return object_error::success; 317 } 318 319 error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec, 320 bool &Result) const { 321 // FIXME: Unimplemented. 322 Result = false; 323 return object_error::success; 324 } 325 326 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec, 327 DataRefImpl Symb, 328 bool &Result) const { 329 const coff_section *sec = toSec(Sec); 330 const coff_symbol *symb = toSymb(Symb); 331 const coff_section *symb_sec = 0; 332 if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec; 333 if (symb_sec == sec) 334 Result = true; 335 else 336 Result = false; 337 return object_error::success; 338 } 339 340 relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Sec) const { 341 const coff_section *sec = toSec(Sec); 342 DataRefImpl ret; 343 if (sec->NumberOfRelocations == 0) 344 ret.p = 0; 345 else 346 ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations); 347 348 return relocation_iterator(RelocationRef(ret, this)); 349 } 350 351 relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Sec) const { 352 const coff_section *sec = toSec(Sec); 353 DataRefImpl ret; 354 if (sec->NumberOfRelocations == 0) 355 ret.p = 0; 356 else 357 ret.p = reinterpret_cast<uintptr_t>( 358 reinterpret_cast<const coff_relocation*>( 359 base() + sec->PointerToRelocations) 360 + sec->NumberOfRelocations); 361 362 return relocation_iterator(RelocationRef(ret, this)); 363 } 364 365 // Initialize the pointer to the symbol table. 366 error_code COFFObjectFile::initSymbolTablePtr() { 367 if (error_code ec = getObject( 368 SymbolTable, Data, base() + COFFHeader->PointerToSymbolTable, 369 COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 370 return ec; 371 372 // Find string table. The first four byte of the string table contains the 373 // total size of the string table, including the size field itself. If the 374 // string table is empty, the value of the first four byte would be 4. 375 const uint8_t *StringTableAddr = 376 base() + COFFHeader->PointerToSymbolTable + 377 COFFHeader->NumberOfSymbols * sizeof(coff_symbol); 378 const ulittle32_t *StringTableSizePtr; 379 if (error_code ec = getObject(StringTableSizePtr, Data, StringTableAddr)) 380 return ec; 381 StringTableSize = *StringTableSizePtr; 382 if (error_code ec = 383 getObject(StringTable, Data, StringTableAddr, StringTableSize)) 384 return ec; 385 386 // Check that the string table is null terminated if has any in it. 387 if (StringTableSize < 4 || 388 (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) 389 return object_error::parse_failed; 390 return object_error::success; 391 } 392 393 // Returns the file offset for the given RVA. 394 error_code COFFObjectFile::getRvaPtr(uint32_t Rva, uintptr_t &Res) const { 395 error_code ec; 396 for (section_iterator i = begin_sections(), e = end_sections(); i != e; 397 i.increment(ec)) { 398 if (ec) 399 return ec; 400 const coff_section *Section = getCOFFSection(i); 401 uint32_t SectionStart = Section->VirtualAddress; 402 uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize; 403 if (SectionStart <= Rva && Rva < SectionEnd) { 404 uint32_t Offset = Rva - SectionStart; 405 Res = uintptr_t(base()) + Section->PointerToRawData + Offset; 406 return object_error::success; 407 } 408 } 409 return object_error::parse_failed; 410 } 411 412 // Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name 413 // table entry. 414 error_code COFFObjectFile:: 415 getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const { 416 uintptr_t IntPtr = 0; 417 if (error_code ec = getRvaPtr(Rva, IntPtr)) 418 return ec; 419 const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr); 420 Hint = *reinterpret_cast<const ulittle16_t *>(Ptr); 421 Name = StringRef(reinterpret_cast<const char *>(Ptr + 2)); 422 return object_error::success; 423 } 424 425 // Find the import table. 426 error_code COFFObjectFile::initImportTablePtr() { 427 // First, we get the RVA of the import table. If the file lacks a pointer to 428 // the import table, do nothing. 429 const data_directory *DataEntry; 430 if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry)) 431 return object_error::success; 432 433 // Do nothing if the pointer to import table is NULL. 434 if (DataEntry->RelativeVirtualAddress == 0) 435 return object_error::success; 436 437 uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress; 438 NumberOfImportDirectory = DataEntry->Size / 439 sizeof(import_directory_table_entry); 440 441 // Find the section that contains the RVA. This is needed because the RVA is 442 // the import table's memory address which is different from its file offset. 443 uintptr_t IntPtr = 0; 444 if (error_code ec = getRvaPtr(ImportTableRva, IntPtr)) 445 return ec; 446 ImportDirectory = reinterpret_cast< 447 const import_directory_table_entry *>(IntPtr); 448 449 // It's an error if there's no section containing the Import Table RVA. 450 return object_error::parse_failed; 451 } 452 453 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec) 454 : ObjectFile(Binary::ID_COFF, Object) 455 , COFFHeader(0) 456 , PE32Header(0) 457 , DataDirectory(0) 458 , SectionTable(0) 459 , SymbolTable(0) 460 , StringTable(0) 461 , StringTableSize(0) 462 , ImportDirectory(0) 463 , NumberOfImportDirectory(0) { 464 // Check that we at least have enough room for a header. 465 if (!checkSize(Data, ec, sizeof(coff_file_header))) return; 466 467 // The current location in the file where we are looking at. 468 uint64_t CurPtr = 0; 469 470 // PE header is optional and is present only in executables. If it exists, 471 // it is placed right after COFF header. 472 bool hasPEHeader = false; 473 474 // Check if this is a PE/COFF file. 475 if (base()[0] == 0x4d && base()[1] == 0x5a) { 476 // PE/COFF, seek through MS-DOS compatibility stub and 4-byte 477 // PE signature to find 'normal' COFF header. 478 if (!checkSize(Data, ec, 0x3c + 8)) return; 479 CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c); 480 // Check the PE magic bytes. ("PE\0\0") 481 if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) { 482 ec = object_error::parse_failed; 483 return; 484 } 485 CurPtr += 4; // Skip the PE magic bytes. 486 hasPEHeader = true; 487 } 488 489 if ((ec = getObject(COFFHeader, Data, base() + CurPtr))) 490 return; 491 CurPtr += sizeof(coff_file_header); 492 493 if (hasPEHeader) { 494 if ((ec = getObject(PE32Header, Data, base() + CurPtr))) 495 return; 496 if (PE32Header->Magic != 0x10b) { 497 // We only support PE32. If this is PE32 (not PE32+), the magic byte 498 // should be 0x10b. If this is not PE32, continue as if there's no PE 499 // header in this file. 500 PE32Header = 0; 501 } else if (PE32Header->NumberOfRvaAndSize > 0) { 502 const uint8_t *addr = base() + CurPtr + sizeof(pe32_header); 503 uint64_t size = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize; 504 if ((ec = getObject(DataDirectory, Data, addr, size))) 505 return; 506 } 507 CurPtr += COFFHeader->SizeOfOptionalHeader; 508 } 509 510 if (!COFFHeader->isImportLibrary()) 511 if ((ec = getObject(SectionTable, Data, base() + CurPtr, 512 COFFHeader->NumberOfSections * sizeof(coff_section)))) 513 return; 514 515 // Initialize the pointer to the symbol table. 516 if (COFFHeader->PointerToSymbolTable != 0) 517 if ((ec = initSymbolTablePtr())) 518 return; 519 520 // Initialize the pointer to the beginning of the import table. 521 if ((ec = initImportTablePtr())) 522 return; 523 524 ec = object_error::success; 525 } 526 527 symbol_iterator COFFObjectFile::begin_symbols() const { 528 DataRefImpl ret; 529 ret.p = reinterpret_cast<uintptr_t>(SymbolTable); 530 return symbol_iterator(SymbolRef(ret, this)); 531 } 532 533 symbol_iterator COFFObjectFile::end_symbols() const { 534 // The symbol table ends where the string table begins. 535 DataRefImpl ret; 536 ret.p = reinterpret_cast<uintptr_t>(StringTable); 537 return symbol_iterator(SymbolRef(ret, this)); 538 } 539 540 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const { 541 // TODO: implement 542 report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile"); 543 } 544 545 symbol_iterator COFFObjectFile::end_dynamic_symbols() const { 546 // TODO: implement 547 report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile"); 548 } 549 550 library_iterator COFFObjectFile::begin_libraries_needed() const { 551 // TODO: implement 552 report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); 553 } 554 555 library_iterator COFFObjectFile::end_libraries_needed() const { 556 // TODO: implement 557 report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); 558 } 559 560 StringRef COFFObjectFile::getLoadName() const { 561 // COFF does not have this field. 562 return ""; 563 } 564 565 import_directory_iterator COFFObjectFile::import_directory_begin() const { 566 DataRefImpl Imp; 567 Imp.p = reinterpret_cast<uintptr_t>(ImportDirectory); 568 return import_directory_iterator(ImportDirectoryEntryRef(Imp, this)); 569 } 570 571 import_directory_iterator COFFObjectFile::import_directory_end() const { 572 DataRefImpl Imp; 573 if (ImportDirectory) { 574 Imp.p = reinterpret_cast<uintptr_t>( 575 ImportDirectory + (NumberOfImportDirectory - 1)); 576 } else { 577 Imp.p = 0; 578 } 579 return import_directory_iterator(ImportDirectoryEntryRef(Imp, this)); 580 } 581 582 section_iterator COFFObjectFile::begin_sections() const { 583 DataRefImpl ret; 584 ret.p = reinterpret_cast<uintptr_t>(SectionTable); 585 return section_iterator(SectionRef(ret, this)); 586 } 587 588 section_iterator COFFObjectFile::end_sections() const { 589 DataRefImpl ret; 590 int numSections = COFFHeader->isImportLibrary() 591 ? 0 : COFFHeader->NumberOfSections; 592 ret.p = reinterpret_cast<uintptr_t>(SectionTable + numSections); 593 return section_iterator(SectionRef(ret, this)); 594 } 595 596 uint8_t COFFObjectFile::getBytesInAddress() const { 597 return getArch() == Triple::x86_64 ? 8 : 4; 598 } 599 600 StringRef COFFObjectFile::getFileFormatName() const { 601 switch(COFFHeader->Machine) { 602 case COFF::IMAGE_FILE_MACHINE_I386: 603 return "COFF-i386"; 604 case COFF::IMAGE_FILE_MACHINE_AMD64: 605 return "COFF-x86-64"; 606 default: 607 return "COFF-<unknown arch>"; 608 } 609 } 610 611 unsigned COFFObjectFile::getArch() const { 612 switch(COFFHeader->Machine) { 613 case COFF::IMAGE_FILE_MACHINE_I386: 614 return Triple::x86; 615 case COFF::IMAGE_FILE_MACHINE_AMD64: 616 return Triple::x86_64; 617 default: 618 return Triple::UnknownArch; 619 } 620 } 621 622 // This method is kept here because lld uses this. As soon as we make 623 // lld to use getCOFFHeader, this method will be removed. 624 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const { 625 return getCOFFHeader(Res); 626 } 627 628 error_code COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const { 629 Res = COFFHeader; 630 return object_error::success; 631 } 632 633 error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const { 634 Res = PE32Header; 635 return object_error::success; 636 } 637 638 error_code COFFObjectFile::getDataDirectory(uint32_t index, 639 const data_directory *&Res) const { 640 // Error if if there's no data directory or the index is out of range. 641 if (!DataDirectory || index > PE32Header->NumberOfRvaAndSize) 642 return object_error::parse_failed; 643 Res = &DataDirectory[index]; 644 return object_error::success; 645 } 646 647 error_code COFFObjectFile::getSection(int32_t index, 648 const coff_section *&Result) const { 649 // Check for special index values. 650 if (index == COFF::IMAGE_SYM_UNDEFINED || 651 index == COFF::IMAGE_SYM_ABSOLUTE || 652 index == COFF::IMAGE_SYM_DEBUG) 653 Result = NULL; 654 else if (index > 0 && index <= COFFHeader->NumberOfSections) 655 // We already verified the section table data, so no need to check again. 656 Result = SectionTable + (index - 1); 657 else 658 return object_error::parse_failed; 659 return object_error::success; 660 } 661 662 error_code COFFObjectFile::getString(uint32_t offset, 663 StringRef &Result) const { 664 if (StringTableSize <= 4) 665 // Tried to get a string from an empty string table. 666 return object_error::parse_failed; 667 if (offset >= StringTableSize) 668 return object_error::unexpected_eof; 669 Result = StringRef(StringTable + offset); 670 return object_error::success; 671 } 672 673 error_code COFFObjectFile::getSymbol(uint32_t index, 674 const coff_symbol *&Result) const { 675 if (index < COFFHeader->NumberOfSymbols) 676 Result = SymbolTable + index; 677 else 678 return object_error::parse_failed; 679 return object_error::success; 680 } 681 682 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol, 683 StringRef &Res) const { 684 // Check for string table entry. First 4 bytes are 0. 685 if (symbol->Name.Offset.Zeroes == 0) { 686 uint32_t Offset = symbol->Name.Offset.Offset; 687 if (error_code ec = getString(Offset, Res)) 688 return ec; 689 return object_error::success; 690 } 691 692 if (symbol->Name.ShortName[7] == 0) 693 // Null terminated, let ::strlen figure out the length. 694 Res = StringRef(symbol->Name.ShortName); 695 else 696 // Not null terminated, use all 8 bytes. 697 Res = StringRef(symbol->Name.ShortName, 8); 698 return object_error::success; 699 } 700 701 ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData( 702 const coff_symbol *symbol) const { 703 const uint8_t *aux = NULL; 704 705 if ( symbol->NumberOfAuxSymbols > 0 ) { 706 // AUX data comes immediately after the symbol in COFF 707 aux = reinterpret_cast<const uint8_t *>(symbol + 1); 708 # ifndef NDEBUG 709 // Verify that the aux symbol points to a valid entry in the symbol table. 710 uintptr_t offset = uintptr_t(aux) - uintptr_t(base()); 711 if (offset < COFFHeader->PointerToSymbolTable 712 || offset >= COFFHeader->PointerToSymbolTable 713 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 714 report_fatal_error("Aux Symbol data was outside of symbol table."); 715 716 assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) 717 == 0 && "Aux Symbol data did not point to the beginning of a symbol"); 718 # endif 719 } 720 return ArrayRef<uint8_t>(aux, symbol->NumberOfAuxSymbols * sizeof(coff_symbol)); 721 } 722 723 error_code COFFObjectFile::getSectionName(const coff_section *Sec, 724 StringRef &Res) const { 725 StringRef Name; 726 if (Sec->Name[7] == 0) 727 // Null terminated, let ::strlen figure out the length. 728 Name = Sec->Name; 729 else 730 // Not null terminated, use all 8 bytes. 731 Name = StringRef(Sec->Name, 8); 732 733 // Check for string table entry. First byte is '/'. 734 if (Name[0] == '/') { 735 uint32_t Offset; 736 if (Name.substr(1).getAsInteger(10, Offset)) 737 return object_error::parse_failed; 738 if (error_code ec = getString(Offset, Name)) 739 return ec; 740 } 741 742 Res = Name; 743 return object_error::success; 744 } 745 746 error_code COFFObjectFile::getSectionContents(const coff_section *Sec, 747 ArrayRef<uint8_t> &Res) const { 748 // The only thing that we need to verify is that the contents is contained 749 // within the file bounds. We don't need to make sure it doesn't cover other 750 // data, as there's nothing that says that is not allowed. 751 uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData; 752 uintptr_t ConEnd = ConStart + Sec->SizeOfRawData; 753 if (ConEnd > uintptr_t(Data->getBufferEnd())) 754 return object_error::parse_failed; 755 Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart), 756 Sec->SizeOfRawData); 757 return object_error::success; 758 } 759 760 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const { 761 return reinterpret_cast<const coff_relocation*>(Rel.p); 762 } 763 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel, 764 RelocationRef &Res) const { 765 Rel.p = reinterpret_cast<uintptr_t>( 766 reinterpret_cast<const coff_relocation*>(Rel.p) + 1); 767 Res = RelocationRef(Rel, this); 768 return object_error::success; 769 } 770 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel, 771 uint64_t &Res) const { 772 report_fatal_error("getRelocationAddress not implemented in COFFObjectFile"); 773 } 774 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel, 775 uint64_t &Res) const { 776 Res = toRel(Rel)->VirtualAddress; 777 return object_error::success; 778 } 779 symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const { 780 const coff_relocation* R = toRel(Rel); 781 DataRefImpl Symb; 782 Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex); 783 return symbol_iterator(SymbolRef(Symb, this)); 784 } 785 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel, 786 uint64_t &Res) const { 787 const coff_relocation* R = toRel(Rel); 788 Res = R->Type; 789 return object_error::success; 790 } 791 792 const coff_section *COFFObjectFile::getCOFFSection(section_iterator &It) const { 793 return toSec(It->getRawDataRefImpl()); 794 } 795 796 const coff_symbol *COFFObjectFile::getCOFFSymbol(symbol_iterator &It) const { 797 return toSymb(It->getRawDataRefImpl()); 798 } 799 800 const coff_relocation *COFFObjectFile::getCOFFRelocation( 801 relocation_iterator &It) const { 802 return toRel(It->getRawDataRefImpl()); 803 } 804 805 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \ 806 case COFF::enum: res = #enum; break; 807 808 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel, 809 SmallVectorImpl<char> &Result) const { 810 const coff_relocation *reloc = toRel(Rel); 811 StringRef res; 812 switch (COFFHeader->Machine) { 813 case COFF::IMAGE_FILE_MACHINE_AMD64: 814 switch (reloc->Type) { 815 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE); 816 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64); 817 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32); 818 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB); 819 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32); 820 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1); 821 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2); 822 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3); 823 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4); 824 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5); 825 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION); 826 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL); 827 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7); 828 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN); 829 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32); 830 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR); 831 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32); 832 default: 833 res = "Unknown"; 834 } 835 break; 836 case COFF::IMAGE_FILE_MACHINE_I386: 837 switch (reloc->Type) { 838 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE); 839 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16); 840 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16); 841 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32); 842 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB); 843 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12); 844 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION); 845 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL); 846 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN); 847 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7); 848 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32); 849 default: 850 res = "Unknown"; 851 } 852 break; 853 default: 854 res = "Unknown"; 855 } 856 Result.append(res.begin(), res.end()); 857 return object_error::success; 858 } 859 860 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME 861 862 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel, 863 SmallVectorImpl<char> &Result) const { 864 const coff_relocation *reloc = toRel(Rel); 865 const coff_symbol *symb = 0; 866 if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec; 867 DataRefImpl sym; 868 sym.p = reinterpret_cast<uintptr_t>(symb); 869 StringRef symname; 870 if (error_code ec = getSymbolName(sym, symname)) return ec; 871 Result.append(symname.begin(), symname.end()); 872 return object_error::success; 873 } 874 875 error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData, 876 LibraryRef &Result) const { 877 report_fatal_error("getLibraryNext not implemented in COFFObjectFile"); 878 } 879 880 error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData, 881 StringRef &Result) const { 882 report_fatal_error("getLibraryPath not implemented in COFFObjectFile"); 883 } 884 885 bool ImportDirectoryEntryRef:: 886 operator==(const ImportDirectoryEntryRef &Other) const { 887 return ImportDirectoryPimpl == Other.ImportDirectoryPimpl; 888 } 889 890 static const import_directory_table_entry *toImportEntry(DataRefImpl Imp) { 891 return reinterpret_cast<const import_directory_table_entry *>(Imp.p); 892 } 893 894 error_code 895 ImportDirectoryEntryRef::getNext(ImportDirectoryEntryRef &Result) const { 896 const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl); 897 Dir += 1; 898 DataRefImpl Next; 899 Next.p = reinterpret_cast<uintptr_t>(Dir); 900 Result = ImportDirectoryEntryRef(Next, OwningObject); 901 return object_error::success; 902 } 903 904 error_code ImportDirectoryEntryRef:: 905 getImportTableEntry(const import_directory_table_entry *&Result) const { 906 Result = toImportEntry(ImportDirectoryPimpl); 907 return object_error::success; 908 } 909 910 error_code ImportDirectoryEntryRef::getName(StringRef &Result) const { 911 const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl); 912 uintptr_t IntPtr = 0; 913 if (error_code ec = OwningObject->getRvaPtr(Dir->NameRVA, IntPtr)) 914 return ec; 915 const char *Ptr = reinterpret_cast<const char *>(IntPtr); 916 Result = StringRef(Ptr); 917 return object_error::success; 918 } 919 920 error_code ImportDirectoryEntryRef::getImportLookupEntry( 921 const import_lookup_table_entry32 *&Result) const { 922 const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl); 923 uintptr_t IntPtr = 0; 924 if (error_code ec = OwningObject->getRvaPtr( 925 Dir->ImportLookupTableRVA, IntPtr)) 926 return ec; 927 Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr); 928 return object_error::success; 929 } 930 931 namespace llvm { 932 933 ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) { 934 error_code ec; 935 return new COFFObjectFile(Object, ec); 936 } 937 938 } // end namespace llvm 939